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Full text of "The Morphology And Evolution Of The Apes And Man"

CLASSIFICATION                             5
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diseased, or removed by experiment, the suppressive functions are withdrawn, the latent power reasserts itself, and Man assumes certain ape-like characters. If the pituitary bodjr and suprarenal capsules are diseased simultaneously in the white races the skin becomes bronzed and hairy, the hands become large and clumsy, and the facial skeleton enlarges; the supra-orbital crests, zygomata and malar bones become prominent; and the raaxillse, mandible, or both together, exhibit prognathism. The teeth become widely spaced, and they are concealed by the lips which are very thick.
It may be asked how the ductless glands come to function differently in Man and the Apes. Bolk (311) believes that diet has played an important part. When Man's ancestors changed their diet from frugi-vorous to omnivorous or carnivorous, the functions of the glands changed, with the result that the body changed both somatically and physiologically. The whole processes of life and development became slowed in Man,
Classification.—At the summit of the Mammalian Class stand the Lemurs, Monkeys, Apes and Man, which comprise the Order Primates. Their relation to one another and to the other Mammals are shown in the following scheme:—
CLASS  MAMMALIA.
Sub-class PEOTOTHEEIA.
Order Monotremata.    Platypus, spiny ant-eater.
Sub-class THE El A.
Section A.    Metatheria.
Order Marsupialia.    Opossums, kangaroos, koala, &c. Section B.    Eutheria.